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Gentoo: GLSA 201602-02 High: GNU C Library Code Execution Issues

gentoo
Calendar Grey February 17, 2016
Dist Gentoo Esm H88
Several critical security flaws in the GNU C library on Gentoo Linux necessitate urgent updates to safeguard the system.
Multiple vulnerabilities have been found in the GNU C library, the worst allowing for remote execution of arbitrary code.

Summary

Multiple vulnerabilities have been discovered in the GNU C Library: * The Google Security Team and Red Hat discovered a stack-based buffer overflow in the send_dg() and send_vc() functions due to a buffer mismanagement when getaddrinfo() is called with AF_UNSPEC (CVE-2015-7547). * The strftime() function access invalid memory when passed out-of-range data, resulting in a crash (CVE-2015-8776). * An integer overflow was found in the __hcreate_r() function (CVE-2015-8778). * Multiple unbounded stack allocations were found in the catopen() function (CVE-2015-8779).
Please review the CVEs referenced below for additional vulnerabilities that had already been fixed in previous versions of sys-libs/glibc, for which we have not issued a GLSA before.

Topics%20covered

Topics Covered

security advisory Gentoo high severity buffer overflow code execution remote execution glibc

Resolution

All GNU C Library users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=sys-libs/glibc-2.21-r2"
It is important to ensure that no running process uses the old glibc anymore. The easiest way to achieve that is by rebooting the machine after updating the sys-libs/glibc package.
Note: Should you run into compilation failures while updating, please see bug 574948.

References

[ 1 ] CVE-2013-7423 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2013-7423 [ 2 ] CVE-2014-0475 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-0475 [ 3 ] CVE-2014-0475 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-0475 [ 4 ] CVE-2014-5119 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-5119 [ 5 ] CVE-2014-6040 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-6040 [ 6 ] CVE-2014-7817 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-7817 [ 7 ] CVE-2014-8121 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-8121 [ 8 ] CVE-2014-9402 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-9402 [ 9 ] CVE-2015-1472 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-1472 [ 10 ] CVE-2015-1781 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-1781 [ 11 ] CVE-2015-7547 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-7547 [ 12 ] CVE-2015-8776 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-8776 [ 13 ] CVE-2015-8778 http://nvd.nist.gov/nvd.cfm?cvena......

Read the Full Advisory

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/201602-02
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Concerns

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.

Severity: High
Title: GNU C Library: Multiple vulnerabilities
Date: February 17, 2016
Bugs: #516884, #517082, #521932, #529982, #532874, #538090,
ID: 201602-02

Topics%20covered

Topics Covered

security advisory Gentoo high severity buffer overflow code execution remote execution glibc

Synopsis

Multiple vulnerabilities have been found in the GNU C library, the worst allowing for remote execution of arbitrary code.

Background

The GNU C library is the standard C library used by Gentoo Linux systems.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 sys-libs/glibc < 2.21-r2 >= 2.21-r2

Impact

===== A remote attacker could exploit any application which performs host name resolution using getaddrinfo() in order to execute arbitrary code or crash the application. The other vulnerabilities can possibly be exploited to cause a Denial of Service or leak information.

Workaround

A number of mitigating factors for CVE-2015-7547 have been identified. Please review the upstream advisory and references below.

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